Japan Geoscience Union Meeting 2019

Session information

[E] Oral

S (Solid Earth Sciences ) » S-GC Geochemistry

[S-GC40] Volatile Cycles in the Deep Earth - from Subduction Zone to Hot Spot

Wed. May 29, 2019 1:45 PM - 3:15 PM A10 (TOKYO BAY MAKUHARI HALL)

convener:Hirochika Sumino(Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo), Takeshi Hanyu(Japan Agency for Marine-Earth Science and Technology, Department of Solid Earth Geochemistry), Yuji Sano(Division of Ocean and Earth Systems, Atmosphere and Ocean Research Institute, University of Tokyo), Gray E Bebout(Lehigh University), Chairperson:Takeshi Hanyu, Gray Bebout(Lehigh University), Yuji Sano, Hirochika Sumino

Volatiles play an important role in the geodynamics and chemical differentiation in the mantle and crust by drastically changing mineral stability and rheological behavior. Fractionation-processes such as partial melting, hydration, and dehydration are all controlled by volatiles in the rocks. A significant portion of the volatiles in the Earth has been thought to be present in the atmosphere and oceans as a consequence of extensive degassing during accretion and subsequent mantle degassing. On the other hand, it has been recently recognized that substantial amounts of volatiles are recycled back into the mantle at subduction zones, where intensive devolatilization of descended materials during arc magma generation was once thought to act as an effective "subduction barrier". However, fundamental questions still remain, such as: how are volatiles species distributed throughout the early and present Earth? What are the mechanisms for, and rate at which, volatiles are fluxed between the atmosphere, crust, and mantle? And what role have volatiles played in driving the evolution of the Earth? The possible role of the core in storing primordial volatiles is also poorly constrained. We therefore welcome contributions from experimental, observational, and modeling studies that help shed light on the deep cycles of volatiles, such as hydrogen, carbon, nitrogen, noble gases, halogens and sulfur. We particularly encourage studies linking the behavior of multiple volatile elements and their isotopic compositions. Studies investigating the linkage between volatile and solid geochemical tracers, the phase equilibria of volatile-bearing mantle assemblages, and the effect of volatiles on the physical properties of the mantle are also welcome.

2:45 PM - 3:00 PM

*Li Zhang1, Hongsheng Yuan1, Eiji Ohtani2, Lianjie Man1, Duck Young Kim1, Dmitry Popov3, Yue Meng3, Eran Greenberg4, Vitali Prakapenka4 (1.Center for High Pressure Science and Technology Advanced Research (HPSTAR), 2.Department of Earth Science, Graduate School of Science, Tohoku University, 3.HPCAT, X-ray Science Division, Argonne National Laboratory, 4.GeoSoilEnviroCARS, University of Chicago)

3:00 PM - 3:15 PM

*Takahiro Ozawa1, Hikaru Iwamori1,2,3, Takeshi Hanyu2, Morihisa Hamada2, Kenji Shimizu4, Ushikubo Takayuki4, Jun-Ichi Kimura2, Q. Chang2, Hitomi Nakamura5, Motoo Ito4 (1.Tokyo Institute of Tokyo, 2.Geochemical Evolution Research Program, Japan Agency for Marine-Earth Science and Technology, 3.Earthquake Research Institute, The University Tokyo, 4.Kochi Core Center, Japan Agency for Marine-Earth Science and Technology, 5.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)




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